var validDefinition = function(){
	this.rules = {
			username: {
				required: true, 
				minlength: 1,
				maxlength: 20
		    }, 
		    password: {
				required: true, 
				minlength: 1,
				maxlength: 20
		    }
		};

	this.messages = {
			username: {
				required: "username is required(필수)",
				minlength: "username needs to be at least length 1",
				maxlength: "username allows the maximum length 20"
			},
			password: { 
				required: "password is requried(필수)",
				minlength: "password needs to be at least length 1",
				maxlength: "password allows the maximum length 20"
			}
		};
};